First, it depends on your goals (specify in the comments).
Secondly, do I understand correctly that these 120 thousand do NOT include a monitor and peripherals?
And it also depends on whether you buy an assembled computer or choose components yourself? Because assembled PCs, as a rule, are 30% more expensive (and at the same time, many components in them are unbalanced and of dubious quality).
I assembled a computer for myself six months ago for 80 thousand rubles (I took almost everything from Citylink). I can say that all the most modern games at ultra settings give me a stable 60 fps. And at the same time, I have a high-quality SSD disk and great potential for overclocking.
But if you are constantly transcoding a large number of videos and / or are professionally engaged in 3D modeling (for example, you work in the field of developing 3d games or draw 3d films), then a computer can (and should) cost from 120-150 thousand rubles.
Worth it if it will be the main working tool and means for making money. If not, then you can assemble more (three times) a cheap machine, almost denying yourself nothing. If so, why spend more?